Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a6fc7252a3ac9b…

MALICIOUS

PDF

104.4 KB Created: 2021-06-05 20:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0f5ea1272a6dfe9d21466a237aa97b89 SHA-1: 1be488ccb481f5363e65b89e4c9293af5b9aa7c7 SHA-256: e2a6fc7252a3ac9b384c0f89df559384d42e886054b393d87851edf8c074e872
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/pbw?utm_term=context+clues+2.1+worksheet+answer+key PDF link annotation
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/kasixozadojiwimaj.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/634b7d3b96.pdfIn PDF document text
    • https://navitadewota.weebly.com/uploads/1/3/4/0/134017874/aecc551b0.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/941e5ace69f8.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/jawelinefib.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/zojotuvimaka-gijemiwugesip-mosafaz.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/xakubi.pdfIn PDF document text
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/4756718afa.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/vesuravudipojemejudi.pdfIn PDF document text
    • https://zopadujebononi.weebly.com/uploads/1/3/1/3/131380983/8214042.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/zubijevij.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/dirirufat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixepal.pbworks.com/f/how_to_make_a_battery_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b4ca62-db0d-47f3-9db2-0063846b95cf/vakusukifesitogo.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144415686/oxford_ib_chemistry_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3371b307-dbe6-4aee-87e6-35749321f90e/tozer_the_pursuit_of_god_free_download.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/ivms_4200_version_3_manual.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/john_naka_bonsai_techniques_2.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/f/textnow_apk_old_version_4.42.0_download_apk.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/f/coordination_chemistry_problems_and_answers.pdfIn PDF document text
    • http://daridameku.pbworks.com/f/troubleshooting_bissell_little_green_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb09b560-c2eb-408b-8287-d5ecd9c85c82/nepolobukivajemaput.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 6784 bytes
SHA-256: 00578228b6cbab6e492f4dd4d26ae55a5e146f6c91e24acd15d1279a9b81b9af
font_01_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 3916 bytes
SHA-256: c5d11544087602c1b58cb6ea9ea17c7996141b53c4b6e8f5ee1e65add9faafac
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 5336 bytes
SHA-256: 380c922a29c83f2d43128421e1cfe5047d9241f3f2c05336693333d843801252
font_03_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16400 bytes
SHA-256: e3c2c635ccd092a8eb53beca1f2ac80d56cc6c34555374fcd211a32f15a2b882
font_04_sfnt_off00016ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE0 16748 bytes
SHA-256: 5c9742375dca242efbda4d9d90939a470890c67bd3b79e7c59809aedd2223269
font_05_sfnt_off00018246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18246 6448 bytes
SHA-256: fa969d3bed8bbabb83db1ffeae926d1a00bea2f53801d73a9e12e543cc9eaf31

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